It depends on what exactly you want to advertise. But in general, I would say it's better not to focus on single method if you want to have bigger reach. Signature campaigns, banner ads, hire some influencers, make paid press releases on popular websites.
How effective promotion results will be, it depends on your budget and how you will spend it. If you don't have good knowledge about marketing, then hire someone who is professional at these things.
Totally agree on this one on which it would really be that depending towards your budget because if you do have plans on hiring or getting and influencer but your budget doesnt fit out then of course
you would really be finding for some alternative ways which cost cheaper but of course expect that exposure wont really be that much compared if its introduced into bigger audience.
You can run some signature campaigns on this forum considering its a crypto based or related kind of business or site or service you do have then it would really be just that relevant that you
should really make out some marketing here on this forum itself on which crypto traffic is really that relevant.You could actually do it for free if we do speak about social media
marketing but of course you are the ones who would really be doing such work and hassle. Ads,banners and other are really those typical methods or type of advertisement or marketing.
Come to mind that it is one of the crucial things needs to be considered specially when you do have a business, exposure is always been that recommended.